20477970 has 24 divisors (see below), whose sum is σ = 53242956. Its totient is φ = 5460768.

The previous prime is 20477959. The next prime is 20477987. The reversal of 20477970 is 7977402.

It can be written as a sum of positive squares in 2 ways, for example, as 18481401 + 1996569 = 4299^2 + 1413^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113677 + ... + 113856.

Almost surely, 2^20477970 is an apocalyptic number.

20477970 is an abundant number, since it is smaller than the sum of its proper divisors (32764986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20477970 is a wasteful number, since it uses less digits than its factorization.

20477970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227546 (or 227543 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 20477970 is about 4525.2591086036. The cubic root of 20477970 is about 273.5871114530.

The spelling of 20477970 in words is "twenty million, four hundred seventy-seven thousand, nine hundred seventy".