20951398 has 32 divisors (see below), whose sum is σ = 36005760. Its totient is φ = 9072000.

The previous prime is 20951387. The next prime is 20951407. The reversal of 20951398 is 89315902.

It is a super-2 number, since 2×20951398² = 877922156308808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27523 + ... + 28273.

It is an arithmetic number, because the mean of its divisors is an integer number (1125180).

Almost surely, 2^20951398 is an apocalyptic number.

20951398 is a deficient number, since it is larger than the sum of its proper divisors (15054362).

20951398 is a wasteful number, since it uses less digits than its factorization.

20951398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 20951398 is about 4577.2697102094. The cubic root of 20951398 is about 275.6794131769.

The spelling of 20951398 in words is "twenty million, nine hundred fifty-one thousand, three hundred ninety-eight".