20474157 has 8 divisors (see below), whose sum is σ = 29780640. Its totient is φ = 12408560.

The previous prime is 20474143. The next prime is 20474161. The reversal of 20474157 is 75147402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20474157 - 2¹² = 20470061 is a prime.

It is a super-2 number, since 2×20474157² = 838382209721298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20474257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310182 + ... + 310247.

It is an arithmetic number, because the mean of its divisors is an integer number (3722580).

Almost surely, 2^20474157 is an apocalyptic number.

It is an amenable number.

20474157 is a deficient number, since it is larger than the sum of its proper divisors (9306483).

20474157 is a wasteful number, since it uses less digits than its factorization.

20474157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620443.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 20474157 is about 4524.8377871477. The cubic root of 20474157 is about 273.5701297500.

The spelling of 20474157 in words is "twenty million, four hundred seventy-four thousand, one hundred fifty-seven".